Telephone-receiver



A. UMHOLTZ. TELEPHONE RECEIVER.

APPLICATION FILED AFRJ, 1919.

Batented; May 18 H20.

AUGUSTUS UMHOLTZ, 0F PGRT CARBON, PENNSYLVANIA.

TELEPHONE-RECEIVER.

Specification of Letters Patent.

Patented May 18, 1920.

Application filed April 7, 1919. Serial No. 288,016.

To aZZ whom it may concern:

Be it known that I, AUGUSTUS UMHOLTZ, a citizen of the United States,residing at Port Carbon, in the county of Schuylkill and State ofPennsylvania, have invented new and useful Improvements in Telephone-Receivers, of which the following is a specification.

This invention relates to telephone receivers or the like, andcomprehends the construction to facilitate the use thereof with moresatisfactory results.

Frequently, it is found necessary when telephoning to hold the receiveran appreciable distance away from ear for the proper hearing, this beingdue to the fact that when the receiver is held against the ear, properair pressure against the car drum is prohibited which of course affectsthe hearing. Then again, when the receiver is held away from the oureither to assist the hearing, or by inexperienced users, the

sound from the receiver can be heard b jothers in the room, thusprohibiting privacy of conversation to a marked degree.

Therefore, it is my purpose to provide the receiver with means wherebythe proper air pressure against the ear drum may be had, when thereceiver is held against the ,ear, thus overcoming the above enumeratedoi jections with the eceiver of the present day use, and perm ing thereceiver to be more conveniently and satisfactorily used by all.

The nature and. advantages of the invention will be better apparent whenthe following detailed description is read in connection with theaccompanying drawing,

-i.he invention residing in the construction,

combination and arrangement set forth in the claim.

in the drawings forming part of this specification, like numeralsofreference indicate similar parts in the several views and wherein Figure1 is a side elevation of a telephone receiver partly in section andconstructed in accordance with my invention.

Fig. 2 is a front end elevation.

The nature of my invention is such that the telephone receiver indicatedat A of the well known construction may be used and slightly modified inorder to embody the principles of the invention. The receiver isprovided at its forward end with an en larged annular head or rim 1%,diephragm 11, and a sound receiving opening 12 arranged in advance ofthe diaphragm and of usual conical formation.

In carrying out my invention, I provide means for admitting air to thesound receiving opening 12 when the receiver is in use, so that thereceiver may be held close against the car without in any way affectingthe hearing. This means as shown in this specific instance consists in anumber of bores 13 which admit of the passage of air from the atmosphereto the ear While the receiver is being used. It is of course to beunderstood that the bores 13 can be of any size or shape, and can alsovary in number, the perforations or passages being disposed in the mostconvenient manner for the admittance of air between the sound disk ordiaphragm 11 and the ear of the user while the receiver is being used.It will be noted that the bores 13 are disposed at an angle so that theinlet extremities of said bores are spaced a considerable dis tance fromthe forward edge of the receiver, so that the inlet extremities of,these bores cannot be obstructed any way when the receiver is in use.ldaniiiestly, the receiver when constructed in acccrcance with inventionpermits of its use without necessitating the holding of the receiver anappreciable distance away from the ear thus rendering its use snoreconvenient and satisfactory to' all, especially inexperienced users.

While I have shown and described What I consider the preferredembodiment of the invention, I desire to have it understood that thesame is merely illustrative of one embodiment thereof to which I do notlimit myself in this connection, as such changes in the construction andarrangement may be resorted to when desired as fall within the scope oiwhat is claimed.

What I claim lSiv A sound conveying member havin a con cavity in one endthereof, and a p urality of radially disposed bores communicating withsaid cavity and openin at the eriphcry of said member, said ores'beingin= clined in a direction away from the mouth of said cavity to havetheir outer ends spaced from the front edge of the member for thepurpose specified.

in testimony whereof l afiin my signature.

S UMHOLTZ.

